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Seagate's are very good hard drives and have some of the best warranties. Western Digital also makes good products.
 
That Logitech picked up some pretty good reviews - the main complaint about it was the premium pricing (although I don't think there was much grumbling about the actual value for money) and it takes a bit of getting used to.

As for the hard drives, have a look at Barefeats.com as it will have some handy suggestions. Also, you're not alone in MacRumors wondering about what HD to upgrade to, so searching here should be useful too.
 
For the HD I'm just looking for something over 100 gigs.

Any idea's?
What speed are you looking for 5400 rpm which is generally a little slower but has slightly better battery life and cost less, or 7200 rpm which is generally faster but uses more battery and will cost more?

either :

seagate 120 gig 5400 rpm $79

or

Seagate 160 gig 5400 rpm $119 which is what I just bought. It is nearly silent and seems faster than the stock 60 gig it replaced.

If neither of these strike you fancy, www.newegg.com has lots of other 2.5" hard drives to choose from.
 
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